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Comparative system analysis of direct steam generation and synthetic oil parabolic trough power plants with integrated thermal storage

Feldhoff, Jan Fabian and Schmitz, Kai and Eck, Markus and Schnatbaum-Laumann, Lars and Laing, Doerte and Ortiz-Vives, Francisco and Schulte-Fischedick, Jan (2012) Comparative system analysis of direct steam generation and synthetic oil parabolic trough power plants with integrated thermal storage. Solar Energy, 86 (1), pp. 520-530. Elsevier. doi: 10.1016/j.solener.2011.10.026. ISSN 0038-092X.


Official URL: http://dx.doi.org/10.1016/j.solener.2011.10.026


Parabolic trough power plants are currently the most commercially applied systems for CSP power generation. To improve their costeffectiveness, one focus of industry and research is the development of processes with other heat transfer fluids than the currently used synthetic oil. One option is the utilization of water/steam in the solar field, the so-called direct steam generation (DSG). Several previous studies promoted the economic potential of DSG technology (Eck et al., 2008b; Price et al., 2002; Zarza, 2002). Analyses’ results showed that live steam parameters of up to 500 C and 120 bars are most promising and could lead to a reduction of the levelized electricity cost (LEC) of about 11% (Feldhoff et al., 2010). However, all of these studies only considered plants without thermal energy storage (TES). Therefore, a system analysis including integrated TES was performed by Flagsol GmbH and DLR together with Solar Millennium AG, Schott CSP GmbH and Senior Bergho¨ fer GmbH, all Germany. Two types of plants are analyzed and compared in detail: a power plant with synthetic oil and a DSG power plant. The design of the synthetic oil plant is very similar to the Spanish Andasol plants (Solar Millennium, 2009) and includes a molten salt two-tank storage system. The DSG plant has main steam parameters of 500 C and 112 bars and uses phase change material (PCM) for the latent and molten salt for the sensible part of the TES system. To enable comparability, both plants share the same gross electric turbine capacity of 100 MWel, the same TES capacity of 9 h of full load equivalent and the same solar multiple of the collector field of about two. This paper describes and compares both plants’ design, performance and investment. Based on these results, the LEC are calculated and theDSGplant’s potential is evaluated. One key finding is that with currently proposedDSGstorage costs, the LEC of aDSGplant could be higher than those of a synthetic oil plant. When considering a plant without TES on the other hand, the DSG system could reduce the LEC. This underlines the large influence of TES and the still needed effort in the development of a commercial storage system for DSG.

Item URL in elib:https://elib.dlr.de/72111/
Document Type:Article
Title:Comparative system analysis of direct steam generation and synthetic oil parabolic trough power plants with integrated thermal storage
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Feldhoff, Jan FabianUNSPECIFIEDhttps://orcid.org/0000-0003-1636-5429UNSPECIFIED
Date:January 2012
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 520-530
Keywords:Direct steam generation; Parabolic trough power plant; System comparison; Thermal energy storage; Phase change material storage; Yield analysis
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:E SF - Solar research (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Applikationsentwicklung (old)
Location: Stuttgart
Institutes and Institutions:Institute of Solar Research
Deposited By: Feldhoff, Dr.-Ing. Jan Fabian
Deposited On:15 Dec 2011 14:33
Last Modified:07 Nov 2023 15:19

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